STEADINESS IN PLANTAR FLEXOR MUSCLES AND ITS RELATION TO POSTURAL SWAY IN YOUNG AND ELDERLY ADULTS

被引：105

作者：

Kouzaki, Motoki ^{[1
]}

Shinohara, Minoru ^{[2
,3
]}

机构：

[1] Kyoto Univ, Grad Sch Human & Environm Studies, Neurophysiol Lab, Sakyo Ku, Kyoto 6068501, Japan

[2] Georgia Inst Technol, Sch Appl Physiol, Atlanta, GA 30332 USA

[3] Atlanta VA Med Ctr, Rehabil R&D Ctr Excellence, Decatur, GA USA

来源：

MUSCLE & NERVE | 2010年 / 42卷 / 01期

基金：

美国国家卫生研究院;

关键词：

aging; ankle torque; postural control; standing; steadiness; KNEE EXTENSOR; OLD ADULTS; FORCE FLUCTUATIONS; MOTOR-PERFORMANCE; TENDON VIBRATION; QUIET STANCE; EMG-ACTIVITY; HAND MUSCLE; BED REST; VARIABILITY;

D O I：

10.1002/mus.21599

中图分类号：

R74 [神经病学与精神病学];

学科分类号：

摘要：

To investigate the functional significance of force fluctuations during voluntary contraction with a select muscle group, we examined the association between force fluctuations during voluntary contraction with plantar flexor muscles and postural sway during quiet standing in 20 young and 20 elderly adults. Young and elderly subjects maintained a quiet standing position on a force platform. They also performed a force-matching task with unilateral isometric plantar flexion. A positive correlation was found in young and elderly adults between the coefficient of variation (CV) of center of pressure during quiet standing and the CV of force during plantar flexion only at contraction intensities of <= 5% maximum voluntary contraction that corresponded to muscle activity during quiet standing. The electromyogram power in the medial gastrocnemius was greater in the elderly than in young adults by similar to 10 Hz during quiet standing and at low contraction intensities during plantar flexion. Fluctuations in motor output during low-intensity plantar flexion were associated with postural sway during quiet standing in both young and elderly adults. Muscle Nerve 42: 78-87, 2010

引用

页码：78 / 87

页数：10

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